The plugins can be any assembly that can be loaded into .NET and inherit from my CFPlugin class, which is a .NET assembly...
.NET will be easiest to program in and of course you could use any of the languages: C++, VB, C#...
I have finished the SDK, but still working on documenting it... Looks like documenting the SDK is going to take longer than writing the thing
once the documentation is complete I will post more information and the API...
SDK support will be in the next release, 1.5...
david